Question

Describe how prolein is tested in food ​

Answer 1

Answer:

The presence of protein is tested by the Biuret test for proteins. The Biurette reagent made of sodium hydroxide and copper (II) sulphate helps in determining the presence of protein in a sample.

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Answer 2

Proteins are detected using Biuret reagent. This turns a mauve or purple colour when mixed with protein.

Test if a food item contains protein:

• Take a small quantity of the food items to be tested.

• Grind/mash/paste/powder the food item.

• Put the food item into a test tube.

• Add 10 drops of water and shake the test tube.

• Using a dropper add two drops of copper sulphate solution to the test tube.

• Add 10 drops of caustic soda solution and shake the test tube.

• Observe the colour of the mixture.

Violet colour indicates the presence of proteins in the tested food item.

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